UIView的陰影設置主要通過UIView的layer的相關屬性來設置

陰影的顏色

imgView.layer.shadowColor = [UIColor blackColor].CGColor;

陰影的透明度

imgView.layer.shadowOpacity = 0.8f;

陰影的圓角

imgView.layer.shadowRadius = 4.f;

陰影偏移量

imgView.layer.shadowOffset = CGSizeMake(4,4);

imgView.layer.shadowOffset = CGSizeMake(0,0);

其實從偏移量上可以看出來，即使偏移量為(0,0)時，圍繞view的四周依然能看到一定陰影。

陰影的路徑

除了通過上面的操作，我們還可以設定陰影的路徑

//路徑陰影
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(-5, -5)];
//添加直線
[path addLineToPoint:CGPointMake(paintingWidth /2, -15)];
[path addLineToPoint:CGPointMake(paintingWidth +5, -5)];
[path addLineToPoint:CGPointMake(paintingWidth +15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(paintingWidth +5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(paintingWidth /2, paintingHeight +15)];
[path addLineToPoint:CGPointMake(-5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(-15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(-5, -5)];
//設置陰影路徑 
imgView.layer.shadowPath = path.CGPath;

總結

以上就是這篇文章的全部內容，希望能對各位iOS開發者們能有所幫助，如果有疑問大家可以留言交流。